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Q.

A wire is in the form of an equilateral triangle of side ‘L’ and the current in each side is ‘i’ and all the sides carry the currents
in clockwise direction. The magnetic induction at the centroid of the triangle is

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a

zero

b

μ04π9iL

c

μ04π63iL

d

μ04π18iL

answer is B.

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Detailed Solution

B1 = 3B
B1=9μ0i2πaB1=18μ0i4πa

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